John Vrooman Wehausen (23 September 1913 – 6 October 2005) was an American applied mathematician considered to be one of the world's leading researchers and pioneers in the field of marine hydrodynamics.

He joined the David Taylor Model Basin as a mathematician, and during his three-year tenure there, he met Georg P. Weinblum, the German ship hydrodynamicist.

[6] In 1956, Wehausen accepted a position at the University of California, Berkeley, where he taught until 1984 and where he remained an active researcher thereafter.

At the time, only three other U.S. institutions—Massachusetts Institute of Technology, the University of Michigan and the Webb Institute—offered accredited degree programs in naval architecture.

[3] In 2002, a Special Symposium during the Offshore Mechanics and Arctic Engineering Conference in Oslo, Norway was organized as a tribute to Wehausen.